i know well Lawson of PowerHouseAutomotive, I have the kit lowering springs of him.
His bar is 19 mm (UltraRacing is 20mm) and are not provided with the rubber with increased holes.
In UltraRacing instead there should also be the new rubbers, new brackets and (hopefully) also rings welded on the bar that prevent lateral movement of the same.

inform all of you (also with photos) When will I receive the bar UltraRacing

 

With your power, your car may need these...


Jaguar XK8 4.0 (1998) Aftermarket Performance Parts / Accessories / Spare Part - Ultra Racing Product Catalog

 

I put the powerhouse bar on my 2004 XKR the same time I put their smaller supercharger (upper) pulley on. Pleased with both parts. I tried the ultra racing front strut bar but it won't clear the supercharger.

 

I finally got the Adamesh springs installed. That's the ticket! They have not sagged and offer the perfect stance. The ride is a bit more firm than the Mina springs, which it definitely needed. The handling is even better. The rears now have a couple inches of clearance between the bump stops, compared to having the Minas sag until they were ON the bump stops. The Mina fronts did fine, but the rears were horrible. I can now go over speed bumps without dragging the bottom. I can now go over big dips in the road without hearing the crunch of rubber bump stops. These Adamesh springs are perfect. They are installed front and rear.

...and yes, it does make me nervous having a business neighbor that sells black pavement tar. Haaaah!

 

Jeff,
The car looks sharp - N I C E !

 

Jeff,

I gotta think you were shipped a set of bad Mina springs. I've had the Mina rear lowering springs in my car for two years now, and there's plenty of clearance with the bump stops, even on bumps.

In any case, glad you got it sorted and the car looks great.



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Jeff's car puts out over 600 HP, which puts a lot of strain on the rear suspension, especially during hard acceleration. It's possible IMO that Mina springs could not handle the torque and as a result have settled. I am almost certain that Mina springs will suffice just fine for a run of the mill XK8 or XKR.